IOTA/IOTA-ES occultation update for (1692) Subbotina / UCAC4 345-135900 event on 2024 Apr 08, 15:20 UT Visible from Summary ------- On 2024 Apr 08 UT, the 38.1353708242818 km diameter asteroid (1692) Subbotina will occult a 10.6 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.50 mag to 16.10 mag (the magnitude of the asteroid) for at most 3.400 seconds. This update is based on, astrometry for the asteroid kindly provided by the IAU Minor Planet Center. This work has made use of data from the European Space Agency (ESA) mission Gaia (http://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, http://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. The event at a glimpse ---------------------- * Rank: 99 * date and approx. time of event: 2024 Apr 08, 15:11 - 2024 Apr 08, 15:30 * geocentric midpoint of event [JD]: 2460409.13943071 * magnitude of target star: 10.61 * magnitude drop [mag]: 5.50 * estimated maximum duration [s]: 3.400 * Moon: 0 % sunlit, 103° distance * Sun: 105° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 39 * 1 sigma uncertainty interval [path widths]: +/- 0.14 * 1 sigma uncertainty interval [seconds]: +/- 2.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.015, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.015", 0.003", 86°) * approx speed of asteroid's shadow [km/s]: 11.3226 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 345-135900 by 1692 Subbotina on 2024 Apr 8 Centre Star Star Sun Path Limits Error Limits Alt E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 Crn o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Latitude Latitude Latitude Latitude 118 0 0 - 5 20 50 15 11 24.6 1 111 -75 - 5 32 1 - 5 9 39 - 5 35 11 - 5 6 28 .... 119 0 0 - 5 43 51 15 11 24.9 2 111 -76 - 5 55 1 - 5 32 41 - 5 58 11 - 5 29 30 0.03 120 0 0 - 6 6 40 15 11 25.3 3 111 -77 - 6 17 50 - 5 55 31 - 6 21 0 - 5 52 21 0.00 121 0 0 - 6 29 18 15 11 26.0 4 111 -78 - 6 40 27 - 6 18 9 - 6 43 37 - 6 14 59 -0.01 122 0 0 - 6 51 43 15 11 26.9 5 111 -79 - 7 2 51 - 6 40 35 - 7 6 1 - 6 37 25 -0.02 123 0 0 - 7 13 55 15 11 27.9 6 111 -80 - 7 25 2 - 7 2 47 - 7 28 12 - 6 59 38 -0.02 124 0 0 - 7 35 53 15 11 29.2 7 110 -81 - 7 47 0 - 7 24 47 - 7 50 9 - 7 21 38 -0.03 125 0 0 - 7 57 38 15 11 30.6 8 110 -82 - 8 8 44 - 7 46 32 - 8 11 53 - 7 43 23 -0.03 126 0 0 - 8 19 8 15 11 32.2 9 110 -83 - 8 30 13 - 8 8 3 - 8 33 21 - 8 4 54 -0.03 127 0 0 - 8 40 23 15 11 34.0 11 110 -84 - 8 51 27 - 8 29 19 - 8 54 35 - 8 26 10 -0.03 128 0 0 - 9 1 23 15 11 36.0 12 110 -85 - 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Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 14.3 Data for the target star ------------------------ * name: UCAC4 345-135900 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 15 31.2566 DE: -21 04 11.426 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 15 31.2566 DE: -21 04 11.426 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 10.6 * B mag [mag]: 11.8 * Diameter [mas]: 0.20 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1692) Subbotina asteroid class: approx. diameter [km]: 38 approx. diameter ["]: 0.025 distance from Earth [AU]: 2.10700 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#54 date of fit: 2023 Apr 24 source of used astrometry: MPC, JPL number of used observations: 0 number of rejected observations: 0 time covered by the observations: 1800 Jan 01 - 1800 Jan 01 1 sigma uncertainty ellipse (major, minor, PA): 0.015", 0.003", 86.3° remarks: * orbital elements for (1692)Subbotina : Mean anomaly = 312.9434084681 deg Arg. of pericenter = 111.8228474743 deg Long. of node = 199.5605659961 deg Inclination = 2.4269231322 deg Eccentricity = 0.1366154855 Semimajor axis = 2.7880061434 AU Perihelion dist = 2.4071213305 AU Mag: H = 11.37, G = 0.15 Epoch of elements : MJD 60408.63943021 TDT (2024 Apr 08.6394) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#542023Apr24,3.40,2024,4,8,15.346337,-0.008856,0.058419,6.317030,0.968035,-0.005480,-0.000222,0.000000,0.000000 -153.3270,-21.0631,-49.77,7.55,False UCAC4 345-135900,18.25868235,-21.0698406,11.75,10.61,9.99,0.2,0,,18.28287301,-21.0630814,5.49,5.66,0,0,0 1692,Subbotina,16.10,38.441,2.1070,0,0,1.883,4.04,,1.8,0 0,312.8080,2024,4,8,111.8228,199.5606,2.4269,0.13662,2.78801,2.40712,11.37,5.0,0.15 1.142,0.0147,0.0033,86,0.0036,Known errors,0.86,0,-1,-1 20240408_135900,60139.28 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 14, 06:44 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org